This everyday activity can reveal your brain's age

The speed at which you walk can help scientists see your brain’s age, in a way.

The walking test is a basic test usually used to test people's functional capacity.

However, you can also use the walking test to get an idea of how your brain has aged.

The average walking speed of men and women from age 50-59 is 1.43m/s ( 4.7ft /s) for men.